The difference between the first one and the second one, works out to a BPV of 4168.00: - - - - ((625.05 - 520.85) / 5) / 0.005 = 4168.00

Surprise! The BPV is either 4166.8, or else it's 4167.0, or else 4168.0

It's a fun little word problem in mathematics, to translate the language of the exchange's Contract Specification into a Big Point Value. Particularly the part where they "round to the next nearest cent per contract". http://www.cmegroup.com/trading/interes ... tions.html